(O,R,M) EGR feedback signal is/was was high - EVR
Error Code :337 Loss of comm usually means a connector is to blame, first step would be to pull and inspect the connectors (in this case, the headlight switch and the cluster module) for damage, or a pin that has been shoved back, then reseat them. If that doesnt fix it, then the PITA job of looking over the whole harness for pinch points.
Either the throttle position sensor (TPS) or the idle air control valve (IAC) is not working. Check the wiring to the TPS sensor and the IAC valve and see if they are plugged in and if there is any broken or frayed wires.